<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>测试</title>
</head>
<style>
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }
    body {
        font-family: Arial, sans-serif;
    }
    .container {
        max-width: 600px;
        margin: 0 auto;
    }
    form {
        margin-top: 30px;
        padding: 10px;


    }
    textarea {
        border: 1px solid #ccc;

    }
    button {
        padding: 8px 8px;
        margin-left:20px;
        margin-top:0;

    }
</style>
<body>
    <div class="container">
        <form id="messageForm">
            <textarea id="message"></textarea>
            <button>提交</button>
        </form>
    </div>
    
</body>
</html>